app.js

'use-strict';

const express = require(`express`);
const app = express();
const exportDir = `export`;

app.use(express.static(__dirname));
app.use(express.static(exportDir));

// this is the old landing page (still showing up in google results)
// for a smoother UX it gets redirected immediately without an error page
app.get(`/documentation/get-started`, (req, res) => {
    res.redirect(301, `/documentation/install-dist`);
});

app.get(`*`, function (req, res) {
    const protocol = req.get(`X-Forwarded-Proto`);
    if (protocol !== `https`) {
        res.redirect(301, `https://` + req.headers.host + req.url);
        return;
    }
    res.sendFile(`index.html`, {root: `.`});
});

app.listen(8081, function () {
    console.log(`Listening on port 8081`);
});